The simple rule in industry is that you cannot have a relationship, married or single, with someone over whom you control selection, promotion or salary. If the situation arises, one of the pair must go somewhere else.
The moral issues are irrelevant. Only the perceived inability to make rational unbiased decisions is relevant.
One of the pair has gone. The situation was resolved before any dubious decisions were made. That should be the end of public interest. The individuals should be allowed get on with their lives.